Atomically thin MoS2: a new direct-gap semiconductor
TLDR
The electronic properties of ultrathin crystals of molybdenum disulfide consisting of N=1,2,…,6 S-Mo-S monolayers have been investigated by optical spectroscopy and the effect of quantum confinement on the material's electronic structure is traced.Abstract:
The electronic properties of ultrathin crystals of molybdenum disulfide consisting of N=1,2,…,6 S-Mo-S monolayers have been investigated by optical spectroscopy Through characterization by absorption, photoluminescence, and photoconductivity spectroscopy, we trace the effect of quantum confinement on the material's electronic structure With decreasing thickness, the indirect band gap, which lies below the direct gap in the bulk material, shifts upwards in energy by more than 06 eV This leads to a crossover to a direct-gap material in the limit of the single monolayer Unlike the bulk material, the MoS₂ monolayer emits light strongly The freestanding monolayer exhibits an increase in luminescence quantum efficiency by more than a factor of 10⁴ compared with the bulk materialread more
Citations
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Interface Engineering for High‐Performance Top‐Gated MoS2 Field‐Effect Transistors
Xuming Zou,Jingli Wang,Chung Hua Chiu,Yun Wu,Xiangheng Xiao,Changzhong Jiang,Wen-Wei Wu,Liqiang Mai,Tangsheng Chen,Jinchai Li,Johnny C. Ho,Lei Liao +11 more
TL;DR: Interface or dielectric engineering is an important step towards the practical implementation of MoS2 devices with the optimized performance in the back- or dual-gated geometry.
Journal ArticleDOI
Probing Interlayer Interactions in Transition Metal Dichalcogenide Heterostructures by Optical Spectroscopy: MoS2/WS2 and MoSe2/WSe2.
TL;DR: In this article, the authors applied optical absorption spectroscopy to investigate van der Waals heterostructures formed of pairs of monolayer transition metal dichalcogenide crystals, choosing MoS2/WS2 and MoSe2/WSe2 as test cases.
Journal ArticleDOI
Strong Second-Harmonic Generation in Atomic Layered GaSe.
Xu Zhou,Jingxin Cheng,Yubing Zhou,Ting Cao,Hao Hong,Zhi-Min Liao,Shiwei Wu,Hailin Peng,Kaihui Liu,Dapeng Yu +9 more
TL;DR: The first observation of strong optical second-harmonic generation (SHG) in monolayer GaSe under nonresonant excitation and emission condition is reported and provides a route toward exploring the structural information and the possibility to observe other nonlinear effects in GaSe atomic layers.
Journal ArticleDOI
Valley and band structure engineering of folded MoS2 bilayers
Tao Jiang,Hengrui Liu,Di Huang,Shuai Zhang,Yingguo Li,Xingao Gong,Y. R. Shen,Wei-Tao Liu,Shiwei Wu +8 more
TL;DR: By folding exfoliated MoS2 monolayers-MoS2 bilayers with different stacking orders, this work provides an effective and versatile means to engineer transition-metal dichalcogenide materials with desirable electronic and optical properties.
Journal ArticleDOI
Self-Supporting Metal-Organic Layers as Single-Site Solid Catalysts.
Lingyun Cao,Zekai Lin,Fei Peng,Weiwei Wang,Ruiyun Huang,Cheng Wang,Jiawei Yan,Jie Liang,Zhi-Ming Zhang,Teng Zhang,La-Sheng Long,Junliang Sun,Junliang Sun,Wenbin Lin,Wenbin Lin +14 more
TL;DR: This work uncovers an entirely new strategy for designing single-site solid catalysts and opens the door to a new class of two-dimensional coordination materials with molecular functionalities.
References
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Emerging Photoluminescence in Monolayer MoS2
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TL;DR: This observation shows that quantum confinement in layered d-electron materials like MoS(2), a prototypical metal dichalcogenide, provides new opportunities for engineering the electronic structure of matter at the nanoscale.
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The transition metal dichalcogenides discussion and interpretation of the observed optical, electrical and structural properties
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TL;DR: The transition metal dichalcogenides are about 60 in number as discussed by the authors, and two-thirds of these assume layer structures and can be cleaved down to less than 1000 A and are then transparent in the region of direct band-to-band transitions.